/*
 *  Copyright 2005 Blandware (http://www.blandware.com)
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.blandware.atleap.webapp.action.forum.forum;

import com.blandware.atleap.webapp.action.core.BaseAction;
import com.blandware.atleap.webapp.form.core.SelectRolesForm;
import com.blandware.atleap.webapp.util.core.WebappConstants;
import com.blandware.atleap.webapp.util.core.CacheUtil;
import com.blandware.atleap.webapp.util.core.WebappUtil;
import com.blandware.atleap.webapp.util.forum.ForumModuleWebConstants;
import com.blandware.atleap.service.core.RoleManager;
import com.blandware.atleap.service.core.PageManager;
import com.blandware.atleap.service.exception.OwnerNotFoundException;
import com.blandware.atleap.service.forum.ForumManager;
import com.blandware.atleap.common.Constants;
import com.blandware.atleap.common.ForumModuleConstants;
import com.blandware.atleap.common.util.QueryInfo;
import com.blandware.atleap.common.util.PartialCollection;
import com.blandware.atleap.model.core.Role;
import com.blandware.atleap.model.core.ContentPage;
import com.blandware.atleap.model.forum.Forum;
import com.blandware.atleap.model.forum.Post;
import com.blandware.atleap.search.SearchManager;
import org.apache.struts.action.*;
import org.springframework.orm.ObjectOptimisticLockingFailureException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.*;

/**
 * <p>Assigns Roles to forum.</p>
 * <p><a href="AssignForumRolesAction.java.html"><i>View source</i></a></p>
 *
 * @author Roman Puchkovskiy <a href="mailto:roman.puchkovskiy@blandware.com">
 *         &lt;roman.puchkovskiy@blandware.com&gt;</a>
 * @version $Revision: 1.2 $ $Date: 2006/05/05 18:11:53 $
 * @struts.action path="/forum/forum/assignRoles"
 * name="selectRolesForm"
 * scope="request"
 * input="inputForward"
 * validate="true"
 * roles="forum-forum-assignRoles"
 * @struts.action-forward name="inputForward"
 * path=".forum.forum.assignRoles"
 * @struts.action-forward name="listForums"
 * path="/forum/forum/list.do"
 * redirect="true"
 * @struts.action-forward name="callAssignRoles"
 * path="/forum/forum/callAssignRoles.do"
 * redirect="false"
 * @struts.action-forward name="unsatisfiable"
 * path="/forum/forum/list.do"
 */
public final class AssignForumRolesAction extends BaseAction {
	/**
	 * @param mapping  The ActionMapping used to select this instance
	 * @param form     The optional ActionForm bean for this request (if any)
	 * @param request  The HTTP request we are proceeding
	 * @param response The HTTP response we are creating
	 * @return an ActionForward instance describing where and how
	 *         control should be forwarded, or null if response
	 *         has already been completed
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
	                             HttpServletRequest request, HttpServletResponse response) throws Exception {

		if ( !isCancelled(request) ) {
			// acquire POJOs for all selected roles
			RoleManager roleManager = (RoleManager) getBean(Constants.ROLE_MANAGER_BEAN);
			SelectRolesForm selectRolesForm = (SelectRolesForm) form;
			String[] selectedRoleNames = selectRolesForm.getSelectedRoles();

			List roles = new ArrayList();
			for ( int i = 0; i < selectedRoleNames.length; i++ ) {
				String roleName = selectedRoleNames[i];
				Role role = roleManager.retrieveRole(roleName);
				if ( role != null ) {
					roles.add(role);
				}
			}

			Long forumId = null;
			if ( request.getSession().getAttribute(ForumModuleWebConstants.FORUM_ID_KEY) != null ) {
				forumId = (Long) request.getSession().getAttribute(ForumModuleWebConstants.FORUM_ID_KEY);
			} else {
				if ( log.isWarnEnabled() ) {
					log.warn("Missing forum ID. Returning to list...");
				}
				return mapping.findForward("listForums");
			}

			ForumManager forumManager = (ForumManager) getBean(ForumModuleConstants.FORUM_MANAGER_BEAN);
			Forum forum = forumManager.retrieveForum(forumId);

			if ( forum == null ) {
				// forum not found. it might be deleted by someone else
				ActionMessages errors = new ActionMessages();
				errors.add("forumNotFound", new ActionMessage("forum.forum.errors.notFound"));
				saveErrors(request, errors);
				return mapping.findForward("listForums");
			}

			forum.setVersion(Long.valueOf(selectRolesForm.getVersion()));

			// remove roles which were unselected
			// list of roles is copied in order to prevent ConcurrentModifictionException to be thrown
			List forumRoles = new ArrayList(forum.getRoles());
			for ( int i = 0; i < forumRoles.size(); i++ ) {
				Role role = (Role) forumRoles.get(i);
				if ( !roles.contains(role) ) {
					forum.removeRole(role);
				}
			}

			// add new roles
			for ( Iterator i = roles.iterator(); i.hasNext(); ) {
				Role role = (Role) i.next();
				forum.addRole(role);
			}

            QueryInfo queryInfo = new QueryInfo();
            Map queryParameters = new HashMap();
            queryParameters.put("topicId", null);
            queryInfo.setQueryParameters(queryParameters);
            queryInfo.setWhereClause(" (post.topic.forum.id = " + forum.getId() + ") ");
            PartialCollection posts = forumManager.listPosts(queryInfo);

			try {
				forumManager.updateForum(forum);
                for (Iterator i = posts.iterator(); i.hasNext(); ) {
                    Post post = (Post) i.next();

                    // remove roles which were unselected
                    // list of roles is copied in order to prevent ConcurrentModifictionException to be thrown
                    List postRoles = new ArrayList(post.getRoles());
                    for ( int j = 0; j < postRoles.size(); j++ ) {
                        Role role = (Role) postRoles.get(j);
                        if ( !roles.contains(role) ) {
                            post.removeRole(role);
                        }
                    }

                    // add new roles
                    for ( Iterator j = roles.iterator(); j.hasNext(); ) {
                        Role role = (Role) j.next();
                        post.addRole(role);
                    }

                    forumManager.updatePost(post);
                }
			} catch ( ObjectOptimisticLockingFailureException e ) {
				// forum was updated or deleted by another transaction
				ActionMessages errors = new ActionMessages();
				errors.add("updateFailed", new ActionMessage("forum.forum.errors.updateFailed"));
				saveErrors(request, errors);
				request.setAttribute(ForumModuleWebConstants.FORUM_ID_KEY, forum.getId());
				return mapping.findForward("callAssignRoles");
			}

            SearchManager searchManager = SearchManager.getInstance(request.getSession().getServletContext());
			// index
			if ( forum.getActive().booleanValue() ) {
				searchManager.reIndexPage(forum, request);
			}

            for (Iterator i = posts.iterator(); i.hasNext(); ) {
                Post post = (Post) i.next();
                if ( post.getActive().booleanValue() ) {
                    searchManager.reIndexPage(post, request);
                }
            }

		}
		return mapping.findForward("listForums");
	}
}
